71817 CD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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71817 CD/P4DBA Bearing Product Overview & Core Advantages
The 71817 CD/P4DBA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This P4 tolerance class bearing features a back-to-back (DB) matched arrangement, providing superior stability and the ability to withstand combined loads (radial and axial). Its extra light preload (Class A) ensures minimal friction and precise running, making it ideal for high-speed spindles and other high-precision machinery.
71817 CD/P4DBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71817 | Basic bearing designation (85mm bore, 110mm OD, 26mm width) |
| C | 15° contact angle |
| D | Duplex bearing (two single bearings) |
| P4 | High precision tolerance class (superior running accuracy) |
| DB | Back-to-Back arrangement for high moment rigidity |
| A | Extra light preload for high-speed operation |
71817 CD/P4DBA Bearing Structural Features & Performance Benefits
Optimized Rigidity and Load Capacity: The back-to-back duplex design creates a wide effective spread, significantly increasing moment stiffness and enabling the bearing to handle substantial combined radial and axial loads simultaneously. The 15° contact angle is optimized for high-speed applications with moderate axial loads.
High-Speed Performance: The phenolic resin cage offers excellent strength-to-weight ratio and smooth operation at the limiting speed of 28,000 rpm. The extra light preload minimizes heat generation and friction, which is critical for maintaining precision at high rotational speeds.
Precision Engineering: Manufactured to P4 tolerance class with tight dimensional control on bore, outside diameter, and width. This ensures minimal runout and superior rotational accuracy for applications where positioning precision is paramount.
Material Quality: Both rings and balls are made from high-grade chrome steel, providing excellent wear resistance and long service life under demanding operating conditions.
71817 CD/P4DBA Bearing Typical Application Areas
- Machine Tool Spindles - High-speed milling, grinding, and turning centers
- Precision Gearboxes - Industrial transmissions requiring high accuracy
- High-Frequency Motors - Spindle motors and high-RPM applications
- Medical Equipment - Dental handpieces and surgical tools
- Aerospace Components - Guidance systems and auxiliary power units
- Robotics - Precision joints and rotary actuators
